ASGI routes with body not extracted from the request

[ahopkins]

See source

This bug only applies to ASGI when sending.

When sending a body to a request on ASGI, the body is not making it through. I have not yet tested if this also applies with streaming requests.

The problem is here:

    async def read(self) -> Optional[bytes]:
        """
        Read and stream the body in chunks from an incoming ASGI message.
        """
        message = await self.transport.receive()
        if not message.get("more_body", False):
            self.request_body = False
            return None         # <<<< we are not returning the body
        return message.get("body", b"")

If a small message comes through that has not hit this read() more than once (again, I am assuming that a streaming request might actually work), the message will look like this:

message = await self.transport.receive()
# message={'type': 'http.request', 'body': b'{"foo": "bar"}', 'more_body': False}

Therefore, we need to return the body even if more_body is False (and also properly set self.request_body.

More testing is needed

[ashleysommer]

Your analysis makes sense to me.